Docs: fix broken links

[valentijnscholten]

Fix some broken links (and some auto-linting done by VSCode)

[dryrunsecurity]

DryRun Security Summary

The pull request makes minor documentation improvements across three markdown files related to DefectDojo's configuration and authentication, including rate limiting details, without introducing security vulnerabilities or credential changes.

Expand for full summary

This PR updates documentation files with minor text modifications, link corrections, and formatting improvements across three markdown files related to DefectDojo's configuration and authentication.

Security Findings:

1. Potential Security Consideration: Rate limiting configuration in rate_limiting.md provides protection against brute force login attempts through account lockout mechanisms
2. No direct security vulnerabilities were identified in the documentation updates
3. No hardcoded credentials or authentication logic modifications were introduced

Code Analysis

We ran 9 analyzers against 3 files and 0 analyzers had findings. 9 analyzers had no findings.

View PR in the DryRun Dashboard.

[mtesauro]

Approved